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June 18th, 2026 :: 11:56 am CDT   

Local Weather Report for
Decatur
Illinois, United States

 Current Decatur Weather Conditions Updated June 18th at 10:54 am 
Temperature:66°F Dew Point:57°F
Barometer:29.77 inHg Wind:N 17 Mph
Humidity:72.7% Visibility:0M
 
 Decatur Weather Forecast Summary  
 
Today
Jun 18th
Friday
Jun 19th
Saturday
Jun 20th
Sunday
Jun 21st
Monday
Jun 22nd
Mostly Cloudy with Showers Mostly Sunny Mostly Sunny Showers Mostly Sunny
71°F
74°F
57°F
76°F
62°F
70°F
59°F
73°F
56°F
 
 Decatur Detailed Weather Forecast  
 
Thursday, June 18th, 2026
Afternoon Temperature: 70°F
A mix of sun and cloud. Windy at times.
Evening Temperature: 64°F
Clear.
Friday, June 19th, 2026
Overnight Temperature: 58°F
Clear.
Morning Temperature: 64°F
Sunny. Windy at times.
Afternoon Temperature: 73°F
Mostly sunny. Windy at times.
Evening Temperature: 67°F
Mostly clear.
Saturday, June 20th, 2026
Overnight Temperature: 64°F
A mix of cloudy and clear skies.
Morning Temperature: 67°F
A mix of cloud and sun with a slight chance of showers.
Afternoon Temperature: 75°F
Mostly sunny with a chance of showers. Slight chance of a thunderstorm. Windy at times.
Evening Temperature: 69°F
Mostly clear with a chance of showers or thundershowers.
Sunday, June 21st, 2026
Overnight Temperature: 63°F
Mostly cloudy.
Morning Temperature: 65°F
Mostly cloudy. Windy at times.
Afternoon Temperature: 65°F
Cloudy with a few showers. Slight chance of a thunderstorm. Windy.
Evening Temperature: 59°F
Cloudy with showers. Windy.
Monday, June 22nd, 2026
Overnight Temperature: 58°F
A mix of cloudy and clear skies with a chance of showers. Windy at times.
Morning Temperature: 61°F
Mostly sunny. Windy at times.
Afternoon Temperature: 73°F
Mostly sunny. Windy at times.
Evening Temperature: 65°F
Mostly clear. Windy at times.
Tuesday, June 23rd, 2026
Overnight Temperature: 56°F
A mix of cloudy and clear skies.
Morning Temperature: 64°F
Sunny with cloudy periods.
Afternoon Temperature: 72°F
A mix of cloud and sun. Windy at times.
Evening Temperature: 65°F
Cloudy with clear periods with a slight chance of showers.
Wednesday, June 24th, 2026
Overnight Temperature: 63°F
A mix of cloudy and clear skies.
Morning Temperature: 64°F
A mix of cloud and sun. Windy at times.
Afternoon Temperature: 71°F
Mostly sunny. Windy at times.
Evening Temperature: 65°F
Clear.
Thursday, June 25th, 2026
Overnight Temperature: 58°F
Clear.
Morning Temperature: 66°F
Mostly sunny.
Afternoon Temperature: 75°F
Mostly sunny.
Evening Temperature: 71°F
Mostly cloudy.
Friday, June 26th, 2026
Overnight Temperature: 64°F
Mostly cloudy with a chance of showers.
Morning Temperature: 64°F
Cloudy with a chance of showers. Windy at times.
Afternoon Temperature: 66°F
Mostly cloudy with a slight chance of showers. Windy at times.
Evening Temperature: 63°F
Clear.





 

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This WeatherCity Weather Forecast for Decatur, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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